The storm hydrograph

Across

1. Means less water is intercepted and evaporated so more water reaches the channel. Throughflow isn't slowed down by roots, so there's a shorter lag time (4, 10)

4. Means more water is intercepted and evaporates, so less water reaches the channel. Throughflow is also slowed down by roots, so there's a longer lag time (4, 10)

5. ... have more vegetation, which decreases discharge. There are also more reservoirs in rural areas - they store water and release it slowly, decreasing discharge in the river below. This means hydro-graphs for rivers in ... are more gently sloping (5, 5)

8. The decrease in river discharge as the river returns to its normal level (7, 4)

9. The increase in river discharge as rainwater flows into the river (6, 4)

10. Causes less runoff and a longer lag time (3, 8)

Down

2. Causes more runoff and a shorter lag time (7, 8)

3. Causes less runoff and a longer lag time (6, 6)

6. The delay between peak rainfall and peak discharge (3, 4)

7. ... have drainage systems and they're covered with impermeable materials - these increase discharge so hydro-graphs for rivers in ... are steep (5, 5)